Chapter 5 seems like it will be very awesome when it comes to BD. Lots of charcter development. Use of a number of previously dropped plotline that made it to the manga but were cut in 1974-75 due to ratings and the reductions of episodes. And a few large battles.
Plus the BIG battle should be near the start of Chapter 6, meaning they will be at least three episodes ahead of the original, giving them more room for plot as they get closer to Iscandar.